Using string enums with string formatting may cause false positives

[ilevkivskyi]

This code:

from enum import Enum

class Responses(str, Enum):
    NORMAL = 'something'
    TEMPLATED = 'insert {value} here'

Responses.TEMPLATED.format(value=42)

fails with Not all arguments converted during string formatting. Using this as Responses.TEMPLATED.value.format(value=42) fixes the issue. Both ways actually work with string enums at runtime (only the latter works with normal enums).

[roberfi]

The same is happening for 3.11 StrEnum classes:

from enum import StrEnum

class Responses(StrEnum):
    NORMAL = "something"
    TEMPLATED = "insert {value} here"

Responses.TEMPLATED.format(value=42)

tmp.py:7: error: Not all arguments converted during string formatting  [str-format]
Found 1 error in 1 file (checked 1 source file)